Hi! did i do this right or was i supposed to combine 5x and 7x by adding them rather than subtracting on both sides ?

Barbara's piano instructors house is 7 1/8 miles from her house. after biking for 1 3/4 miles she stops to rest how much longer does she need to bike to reach her instructor's house

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?

Mon wants to make 5 lbs of the sugar syrup. how much water and how much sugar does he need… …to make 5% syrup?